在setContentView（R.layout.activity_main）中创建的第一个应用程序上的Eclipse和Android ADT错误

Question

I have no word. How is possible that Google permit a thing like this?!?! I've read a thousand of documentation before to download Eclipse + Android ADT. After installation, like every time I made an installation of a new development system, I try to write the simple app: "hallo world". How is possible that a simply stuff like "hallo world" don't goes?!?

First the error on "R"... that brings the error "cannot be resolved to a variable". The fix is to add:

import android.R;

Ok... was easy. One minute on Stackoverflow and the solution is served. Then..... BANG... immediatly the second error:

• setContentView(R.layout.activity_main); generates "activity_main cannot be resolved or is not a field"
• getMenuInflater().inflate(R.menu.main, menu); generates "main cannot be resolved or is not a field".

At this point I've read many (too much) post over this issue, but without to see the light...

I repeat, is incredible that a system to develop app for the most widespread mobile operating system has errors at the first installation..... Sure will be my fault...

Any suggestion is appreciated ?

Answer 1

You should never import android.R.

You should instead import com.example.yourapp.R

android.R is full of resources that are baked into the Android SDK. Your own resources are not in that class.

Answer 2

I've finally understood. When I created my first project I've not used the convention com.example.myapp but "my convention" com.myname.myapp (like I can do with xCode). Now using import

com.example.myapp.R;

working.... But now the question is: I can't change the word "example" in the package's name?